Manchester City manager Roberto Mancini has made Lazio defender Aleksandar Kolarov his fourth major signing since the end of last season.
The 24-year-old Serbia international, who has passed a medical and been granted a work permit, will provide direct competition for Wayne Bridge at Eastlands.
Mancini said of Kolarov, who is reported to have cost City £16million:"I want two top-class players for each position.
"I first saw Kolarov when he made his Lazio debut back in 2007. He was composed on the ball had an excellent delivery with his left foot and was technically very able.
"I have watched him a lot since then and so have the Manchester City scouts. His attacking capability is very good. He is fast and can shoot with power and accuracy.
"He also has the ability to play in numerous positions and is very good in midfield. This is an additional benefit to the team.
"He has a fantastic international career ahead of him and I am looking forward to working with him."
Mancini had already signed David Silva, Yaya Toure and Jerome Boateng this summer with Kolarov's arrival increasing his spending to approximately £75million since the end of last season.